--I tried many times,but I still failed in the experiment.

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--I tried many times,but I still failed in the experiment.
--Don’t be discourage d． ____ and the problem will be settle ．
A． Making a little effort B． There being a little effort
C． If you make a bit effort D． A bit more effort
选D ,A为什么不行?解释选项A\B\C\D谢谢

…… and …….
and的前后各作为一句完整的话,and表示后文是前文的结果.
AB是状语从句,不能独立存在,C是if从句后面不能有and,D有省略,原句是You make a bit more effort...

--I tried many times,but I still failed in the experiment. -I tired many times,but i still failed in the exam Did you start the car___?Yes,I did..But I tried many times. 初中英语32.---- I 've tried my best but i failed in the exam aga i tried ____ (open ) the door ,but i failed . I told him many times but he failed ( )(understand)it. I tried to ___ you many times,but no one answered the phone. I tried to catch the bus,but failed.How__I was. I've tried several times,but the car just__. She still failed in the exam,_______she tried her best. I tried my best to work out the maths problem but I failed.同 i told him many times but he failed _____（understand) it.